linux-kernel - Re: [PATCH v4 0/4] KVM: nVMX: Disallow access to vmcs12 fields that aren't supported by "hardware"

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Message-ID: <177016226753.561649.856634993293627748.b4-ty@google.com>
Date: Tue,  3 Feb 2026 16:10:29 -0800
From: Sean Christopherson <seanjc@...gle.com>
To: Sean Christopherson <seanjc@...gle.com>, Paolo Bonzini <pbonzini@...hat.com>
Cc: kvm@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Xiaoyao Li <xiaoyao.li@...el.com>, Chao Gao <chao.gao@...el.com>, Xin Li <xin@...or.com>, 
	Yosry Ahmed <yosry.ahmed@...ux.dev>
Subject: Re: [PATCH v4 0/4] KVM: nVMX: Disallow access to vmcs12 fields that
 aren't supported by "hardware"

On Thu, 15 Jan 2026 09:34:23 -0800, Sean Christopherson wrote:
> Disallow accesses to vmcs12 fields that are defined by KVM, but are unsupported
> in the current incarnation of KVM, e.g. due to lack of hardware support for the
> underlying VMCS fields.
> 
> The primary motivation is to avoid having to carry the same logic for shadowed
> VMCS fields, which can't play nice with unsupported fields since VMREAD/VMWRITE
> will fail when attempting to transfer state between vmcs12 and the shadow VMCS.
> 
> [...]

Applied to kvm-x86 vmx, thanks!

[1/4] KVM: nVMX: Setup VMX MSRs on loading CPU during nested_vmx_hardware_setup()
      https://github.com/kvm-x86/linux/commit/26304e0e694f
[2/4] KVM: VMX: Add a wrapper around ROL16() to get a vmcs12 from a field encoding
      https://github.com/kvm-x86/linux/commit/c68feb605cc4
[3/4] KVM: nVMX: Disallow access to vmcs12 fields that aren't supported by "hardware"
      https://github.com/kvm-x86/linux/commit/5fdf86e7353c
[4/4] KVM: nVMX: Remove explicit filtering of GUEST_INTR_STATUS from shadow VMCS fields
      https://github.com/kvm-x86/linux/commit/1dc643205953

--
https://github.com/kvm-x86/linux/tree/next